Instrument for cutting off glass tubes



(No Model.)

B. B. TOEDT & E. P. BUR'NHAM. INSTRUMENT FOR CUTTING OPP GLASS TUBES.

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UNITED STATES PATENT OFFICEO EMANUEL B. TOED'I AND EDVVABD P. BURNHAM, OF ALBANY, NE\V YORK.

INSTRUMENT FOR CUTTING OFF GLASS TUBES.

SPECIFICATION forming part of Letters Patent No. 363,563, dated May 24, 18(27.

Application filed January 17, 1855. Serial No. 153,155. (No model.)

To all whom it may concern: round bar of suitable size to slip freely into Be it known that we, EMANUEL B. TOEDT the bore of the glass tube to be cut. The said and EDWARD P. BURNHAM, both of the city armis provided with ahandle, b,wl1ich is like 5 and county of Albany, in the State of New the handle a of the upper arm, the two han- 5 York, have invented a new and useful lnstrudles a and I) being arranged so as to be grasped ment for Cutting Ot't Glass Tubes, of which the in one hand of the operator, and the two arms following is a tall and exact description, ref- A and B being jointed to work on the pivot erenee being had to the accompanyingdrawb, in the manner of a pair of shears or tongs. o ings, which form part of this specification, and The cutter O is preferably made in the form [0 in whichof a-disk of hardened steel, provided with a Figure 1 is a side elevation of our instruknife-edge around its perimeter and fitted to ment, the outer ends of the arms being shown revolve freely 011 a center-pin, c. The said in section; Fig. 2, an inverted plan view of the cutter can be arranged eccentrically to the arm 65 outer end of the upper arm; Fig. 8, an end B, as shown in Figsl, 3, and 4, or eoncentric- I elevation oftheinstrument; Fig. 4, an enlarged ally to the said arm, as shown in Fig. 5. then transverse section, at the line 00 0c of Fig. 1, of arranged eccentrically to the arm B, the said the lower arm of the instrument; and Fig. 5, a cutter is fitted into a transverse out, If, in the side elevation of the outer ends of both arms upper side of said arm, and near the outerend 7 of the instrmnentfshowing a modification of thereof, and said cutter is so arranged that the our invention. upper part of its cutting-edge will project Our invention consists of an instrument slightly above the upper surface of said arm.

made in a shape approximating a pair of The center-pin c isscrewed into the end of the i shears, the lower arm of which is made in the arm, and its inner end, reduced in diameter, 75 form of'around bar of suitable diameter to slip extends through the center hole of the cutter freely into the bore of the tube to be cut. The and enters the body of the arm B, so asto form said lower arm is provided at or near its outer a stable bearing for said cutter to revolve on. end with a cutter adapted to incise the surface when arranged concentrically to the arm B, ofthe glass insidethe bore of the tube, and it the cutter O is made slightly larger than the 83 is also provided with a movable collar,which diameter of the arm, and is attached, as shown 0 serves as a guide for the end of the tube durin Fig. 5, to the outer end of said arm by the ing the operationot' cuttin The upper arm center-pin c, which is screwed into the end of ot'the instrument is of the same length as the thearm, and forms a stud on which the said lower one, and is provided with a segmental cutter can revolve quite freely. By means of 85 flange,wl1ich bears against theouter surface of the screw center -pin a the cutter O can be 3 5 the tube in the operation of cutting, the inner readily removed so as to substitute-a new cut surface of said fiangebeingprovided with a deter whenever occasion requires. \Vhen prepression,whicl1 closes over the cutter when the ferred, a diamond or other glass-cutting subtwo arms are closed together, so as to form a stance can be inserted in the upper surface of 90 shield for said cutter for the purpose of prothe arm B, to serve as a permanent cutter, as

tecting it from injury. a substitute for the revolving cutter 0.

As represented in the drawings, A is the up- The collar D is bored to slide freely 011 the per arm, B the lower arm, 0 the cutter, and D lower arm, B, and is preferably made with a the movable collar or gage. projecting flange, d, of greater diameter than 95 The upper arm, A, is provided at the outer the bore of the tube on which the instrument end with a segmental flange, a,whose concave is to be used. Said flange is provided with a surface is arranged to lap over the lower arm, notch, d, in the upper side, so as to permit B, and has a transverse depression, a, cut the upper arm, A, to approach the lowerarm, therein to form a pocket for closing over the B, sufficiently closeto obtain for the segmental 1:0

cutter O. The opposite end of the upper arm flange a therequired pressure against the outer is fashioned to form the handle a of the orsurface of a tube to be cut, The setserew d dinary form for cutting-instruments. is inserted in the collar D'for the purpose of The lower arm, B, is made in the form ,of a securing said collar at any required point on the arm B; and for the purpose of facilitating the setting of said collar, the arm B is marked with graduations of the inch and fractions thereof, to show at a glance the distance between the cutting-edge of the cutter Oand the face of the collar D.

The operation of this instrument is as follows: The collar D being adjusted at the required distance from the cutter C, and the instrument being held by the operator in one hand, the tube to be cut is slipped over the arm 13 until the end of said tube is in contact with the face of the collar D. Then, by pressing together the handles a and Z), the segmental flange a is made to bear with gentle force against the outer surface of the tube, directly above the cutter O. The operator,with his free hand, while keeping the end of the tube against the collar D, revolves the tube between the cutter and segmental flange, thereby producing an incision in the surface of the bore of the tube,

which, if it does not at once cause a severing of the tube, will indent it sufficicntly to produce aseparatiou at the marked line on the application of a slightjar or strain.

We claim as our invention- In aninstrument for cutting off glass tubes, the combination of the arm A, provided with a segmental flange, to, having a transverse depression, a, in its under face, with the arm 13, rotary cutter O, and the removable center-pin c, screwed in said arm B, on which said cutter turns, the said flange a closing over said outter 0 and allowing the same to enter its depression a when the two arms are closed together, thus serving as a shield to said cutter, 

